racedo:
Your "who has been targeting civilians" questions seems a non sequitur regarding who did or didn't sign up to guarantee a deal.
Likewise, just what are you referring to from the 1860's? Was the US involved with the Ukraine in the 1860's? I don't recall that, to be honest. I am not sure what the point of the allusion is.
US Govt happy breaking treaties with its own people from 1860's onwards.
Explainer: The Budapest Memorandum And Its Relevance To Crimea
As for Budapest Treaty......... its not, its a political document and that view is from the US.
Victoria Nuland spending $5 Billion on Ukraine...................... what was that about again ?